Patent GB-190605557-A (GB)
Title: Improvements in or relating to Calculating Apparatus applicable to Typewriters.
Inventor: HANSON HANS
Filed: 1906-03-07
Granted: 1907-02-07
Abstract: 5557. Hanson, H. March 7. Typewriters and like machine.-In a single-bank, key-set, leveroperated computing-machine described as applied to a typewriter, there is a special set of nine computing-keys, the depression of any member of which-actuates also the corresponding numeralprinting key, although the latter may be operated freely to print only ; the typewriter carriage controls. at will the denomination selector of the computing-mechanism, and an additional laterallymovable set of differential stop mechanisms is provided to enable a multiplicand to be set at various denominations, together with a multiplier indicator. The machine, which is shown in sectional elevation and sectional plan in Figs. 5 and 6 respectively, most of the calculating parts being arranged in a casing 31 below the typewriter, is of the class in which the numeral wheel a of every denomination of the totalizing-counter has its own operating rack-bar c with nine setting-pins c<10>, and each computing-key b by swinging down its transverse setting-bar b<10> is adapted to set the corresponding pins in all the rack-bars but only actually does' so in that rack-bar momentarily chosen by the denomination-selector shaft f, which is driven by the typewriter carriage and selects from left to right. Wt.ien. an item has been set, the operating-handle' upon the shaft c<18> is rocked forward, carrying the main operating-carriage and rack-bars through distances determined by the pins, re.setting and return of the rack-bars following upon the backward stroke. The improvements have reference to (1) line-spacing and tabulating adjustments for the typewriter carriage, (2) interlock between the writing and computing numera keys, (3) carriage return by the operating-handle, and (4) key-protector. (1) The impression roller is turned for line-spacing by a pawl, ratchet, and finger-bar 12. Upon depression of the tabulating key, one of the carriage racks 15 is lifted out of gear with the spacing escapement and the main spacing spring returns the carriage to the right by engagement with the second rack ; increased pressure on the key applies a brake ; the motion may be completely arrested by adjustable columnstops which the key moves into the path of a lug on the carriage. (2) Each plunger computing-key b carries a projecting hook adapted on depression to slip into and engage a' recess upon the corresponding typewriter lever-numeral key 6 and carry it down also to print as well as register the figure, and to prevent either, impulsive operation of the printing by the computing keys or movement of the latter if printing only is desired. (3) Return of the typewriter carriage to the right for computing purposes is effected by a cord and pulley c<40> geared to move with the handle spindle ; a spring takes up slack, and a sliding bolt c<46> upon' the handle co-operates with an adjustable, stop'upon a sector geared to the pulley to determine how far the carriage shall move. (4) A transverse key-protector bar g is pivoted upon side bars and either prevents the typewriter numeral keys from. being struck or engages beneath the Heads of the computing-keys to prevent operation ; though normally spring - held over the typewriting keys, it is positioned as shown by operation of the handle and released when the highest rack-bar is selected. When the computing-keys are free, the "1" type-writer key is also locked.